Learning bike



FIG. 1 is a front perspective view showing the learning bike;

FIG. 2 is a rear perspective view of the learning bike;

FIG. 3 is an enlarged perspective view of the rear of the seat of the learning bike, shown separately for clarity; and,

FIG. 4 is an enlarged perspective view of the front fork of the learning bike, shown separately for clarity. 

The ornamental design for a learning bike, as shown and described. 